Customize a Wordpress Blog

I have a Wordpress food blog that needs some custom modifications. I am a web designer, and have all of the wireframes / psds needed. The main edits are for the nav bar, home page, footer, and some sidebar elements. I don't need detailed CSS changes, since I can do those myself. It would be great if the developer had prior experience working with blogs or with filter plug ins. The current site is here: [login to view URL] The only sections that look decent are the recipe page, and the recipe show pages. It currently has some recipe content, which I do not want to lose during the modification process. The site designs are heavily inspired by the spacing / styling from here: [login to view URL] It's also worth mentioning that I will also need a pop up form correctly connected to my Mail Chimp account. I am currently using Sumo for the popups, but I am not pleased with their services and would like to change. If you have other recommendations on optimization, I would be happy to hear those as well. I want to use as much of the current site as possible, since it is a shame to waste the time/money I've already spent on it. I have a Google Doc with all of the feature changes I would like, as well as all of the pngs. I would be happy to share those with you if you are interested in this project. Thanks!